<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
  <h2>{{text}}</h2>
  <button @click="fn()">逆转</button>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
  const vm = new Vue({
    el:'#app',
    data:{
      text:'Hello World'
    },
    methods: {
      fn(){
        this.text=this.text.split('').reverse().join('')
      }
    },
  })
  </script>
</body>
</html>